[Bug]: 31.0.0 RC2 File Drop folder fails

[K3das]

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

When uploading a folder through file drop on 31.0.0 rc2, the WebDav MKCOL request fails with Only PUT is allowed on files drop returned in the HTTP response. No errors are displayed in the UI, but "Unknown error during upload" is displayed when trying to cancel the upload.

Steps to reproduce

1. Run NC 31 rc2 (docker run --rm -p 8080:80 lscr.io/linuxserver/nextcloud:develop-version-31.0.0rc2)
2. Create a file drop with default permissions and configuration
3. Upload a folder using "upload folders"

Expected behavior

Folder uploads

Nextcloud Server version

31

Operating system

None

PHP engine version

None

Web server

None

Database engine version

None

Is this bug present after an update or on a fresh install?

Fresh Nextcloud Server install

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

List of activated Apps

Nextcloud Signing status

Nextcloud Logs

Additional info

No response

[szaimen]

FYI @susnux

[susnux]

I think we need to split this issue into two:

1. Its a bug that you see the upload folder option
2. Add a feature request to support uploading folders ( Allow uploading folders on file-drop ("upload only") shares #15921 )

Uploading folders also did not work on older Nextcloud versions.
The problem why we forbid this is that for files we ensure they are unique when uploading (or we rename them if needed).
For folders the problem is there is currently no logic to restrict uploaders to the folder they created to prevent writing into new folders of other uploaders.

So this should be fixed first before allowing folder upload.